cyclops1101 wrote:Ive tried

reverse picking, raking, individual lifting, pulling faces

and then giving up and picking a standard lock

.
Im unsure as to how to proceed with this tri-circle and/or other security locks (Will try sidebars if and when security pins become no probs, i hope!)
I am really tempted to buy a repinnable practise lock(can anybody help me find a euro cylinder that does not need cutting etc?) but I dont really understand how this will give me the skill and technique to overcome these darn pins.
Can anyone offer me some more help??
e.g practical experience etc
As far as a practice lock is concerned, I am not familiar with exactly what lock cylinders are available in the UK, but I would assume that you can get a cylinder that is a lot simpler to repin than a Euro cylinder.
I am sure UK members will be able to give you a more specific answer, but I believe manufacturers such as Yale, ERA and Zone will make cylinders that you can rekey simply - as described in detail elsewhere on the forum - using just a simple plug follower and tweesers. There should be no need to procure/improvise a Euro jig, or cutting a Euro cylinder in half to have a repinnable practice lock.
As far as understanding how these repinning exercises will help you overcome security pins, follow the same concept of digital_blue's pyramid learning method.
Assuming you are already familiar with single-pin picking a standard cylinder without security pins, start with one security pin, and one normal pin in the lock.
Learn to feel how security pins feel and react whilst picking. Learn to recognise a false set, then learn to locate and set the security pin(s) causing the false set. Again, follow d_b's exercise, adding more pins to the lock, and progressively more security pins. Practice, practice and practice, and you will be able to recognise and overcome them.
Spool, mushroom and serrated pins are different, if you search you can find pictures of them, and should be able to see why they will feel and react differently. There are also other more exotic security pins, such as a serrated spool.
Hope this helps, I am sure you will master security pins with some methodical practice.
...Mark